Finding the Fourth Proportional to 16,217.72, 22,380.42 and 9,144.10

Step by Step Solution

1. Step 1: Write the proportion equation
   16,217.72 : 22,380.42 = 9,144.10 : x
2. Step 2: Convert to fraction form
   16,217.72/22,380.42 = 9,144.10/x
3. Step 3: Cross multiply
   16,217.72x = 22,380.42 × 9,144.10
4. Step 4: Simplify right side
   16,217.72x = 204,648,798.52
5. Step 5: Solve for x
   x = 204,648,798.52/16,217.72
6. Step 6: Final answer
   x = 12,618.84